M365 Platform Engineer

Maximus is a trusted federal partner supporting mission‑critical programs across national security, defense, and public service delivery. Our work focuses on sustaining, operating, and improving essential government systems and services, with proven operational excellence, and a commitment to mission success for our customers. Joining Maximus means becoming part of a collaborative, mission‑driven organization where teamwork, accountability, and professional growth are core to how we operate. We invest in our workforce through training, education, and career development, empowering professionals to deliver high‑impact solutions while contributing to outcomes that matter at a national scale. This position is contingent upon contract award and position availability. Selected candidates will receive a contingent offer of employment, which will become final only upon successful contract award to Maximus, availability of the position, and receipt of authorization to proceed. Ability to obtain and maintain a Public Trust is required. An active Public Trust and/or DHS suitability is preferred. Must be a U.S. Citizen without dual citizenship. Maximus TCS (Technology and Consulting Services) Internal Job Profile Code: TCS135, T3, Band 6 Job‑Specific Essential Duties and Responsibilities: Provide Tier‑3 engineering support for Microsoft 365 GCC, Exchange Online, hybrid Exchange Server, and SharePoint Online environments, ensuring platform availability, performance, and security. Manage, monitor, restore, and optimize enterprise email and messaging services, including mailbox services, transport, retention, and e‑discovery capabilities. Support SharePoint Online platform operations, including site collections, permissions, integrations, and collaboration workloads aligned with enterprise messaging services. Plan, test, execute, and support upgrades, patches, and migrations across cloud and hybrid environments while minimizing user impact and service disruption. Perform break‑fix restoration, root cause analysis, and complex incident resolution in coordination with incident management and cybersecurity teams. Support the segregation and elimination of malicious software and spam traffic in accordance with security policies and directives. Develop and maintain technical documentation, standard operating procedures, and platform diagrams. Job‑Specific Minimum Requirements: Bachelor’s degree in Information Technology, Computer Science, or a related field or equivalent years of relevant experience. 5+ years supporting Microsoft enterprise collaboration platforms, including Microsoft 365, Exchange, and/or SharePoint in cloud or hybrid environments. Demonstrated experience administering Microsoft 365 (Government or Commercial) environments, including Exchange Online and hybrid Exchange Server, supporting large enterprise user populations (10,000+ users). Hands‑on experience providing Tier‑3 engineering support, including complex incident resolution, root cause analysis, service restoration, and execution of approved changes in production cloud and hybrid environments. Experience administering SharePoint Online, including site collections, permissions, governance controls, and integration with Microsoft 365 collaboration services. Experience planning and executing upgrades, patches, and migrations for enterprise messaging and collaboration platforms. Working knowledge of email security and malware mitigation, including spam filtering, malicious content isolation, and alignment with cybersecurity policies and NIST SP 800‑53 controls. Ability to obtain and maintain a Public Trust (or higher) clearance. Preferred Skills and Qualifications: Microsoft 365 certification Hands‑on experience with Microsoft 365 GCC or other regulated government cloud environments. Experience supporting large‑scale hybrid Exchange deployments. Strong understanding of email security, spam filtering, and malware mitigation. Experience with SharePoint Online administration and integration with Teams and Exchange. Familiarity with ServiceNow or similar ITSM platforms. Experience operating in a 24x7x365 enterprise operations environment. Maximus is an equal opportunity employer. We evaluate qualified applicants without regard to race, color, religion, sex, age, national origin, disability, veteran status, genetic information and other legally protected characteristics. Minimum Salary $80,000 Maximum Salary $120,000 #J-18808-Ljbffr